U.S. Department of Energys Lawrence Berkeley National Laboratory is close to creating miniature gadgets that harvest electrical energy from everyday tasks, The project relies on piezoelectricity, a concept that dates back to the 1880s and that basically means mechanical stress, such as a tap or a vibration, can cause the appearance of an electric charge in a solid. Researchers stacked up 20 layers of virus films between two gold-plated electrodes and managed to generate about a quarter the voltage of a triple battery.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/viruses-spark-up-electricity-hunt-at-berkley-lab-2/